Fremgangsmåte for påföring av et flerlags, termisk barrierebelegg på en superlegeringsartikkel og et flerlags, termisk barrierebelegg

摘要

A ceramic thermal barrier coating layer (28) for a superalloy article (20) is caused to adhere to the superalloy article (20) by applying platinum to the superalloy article (20) and heat treating at a temperature of 1100 DEG C to 1200 DEG C for one hour. This causes aluminium to diffuse from the superalloy article (20) into the platinum to form a platinum enriched outer layer (24) which generally comprises a platinum enriched gamma phase (36) and a platinum enriched gamma prime phase (38). An alumina layer (26) is formed between the platinum enriched outer layer (24) and a ceramic coating (28). The platinum enriched gamma phase (36) and the platinum enriched gamma prime phase (38) in the outer layer (24) reduces the migration of transition metal elements to the ceramic coating (28) to enable a very pure alumina layer (26) to be formed.